Obviously with the Lipo it's quite a bit faster...I'd say 3-4mph...which is significant. I noticed on carpet it was a little more tippy...but not much. I was able to adjust setup to compensate...on asphalt so far it seems to be rock solid with only pluses and no drawbacks. In a 5 minute qualifier I am using 600mah! It also makes the car react a little faster being as it's lighter. Tamiya USA would be crazy not to allow this next year in TCS.